Honda cg125 Burning oil, help plz !

[peter_700]

Hi

I have got a honda cg125 and i am looking for some advice.

The bike is a 1991 honda cg125 Br and it has 12,172 miles showing on the clock i have no idea if that is genuine or not but any way.

I have given the bike a service changed the oil and filled it up, but it is losing oil. There are no drips or leaks so i assume that the oil is getting into the piston i think it might be the piston rings but my motorbike knowledge is limited to say the least.

I was wondering what to do should i just keep on topping up the bike with oil and leave it or should i get it fixed? If i got it fixed would it be very expensive. ?

Any help would be appreciated.

pete

[Itchy]

I'd probably measure the rate at which it is burning oil tbh , if its more than say 1.5 litres per 1000 miles Yamaha thunderaces burn oil at about 750ml per 1000 miles.

But 1 litre per 1000 miles is an extra £4 in oil per 1000 miles ie 0.004p extra per mile.
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[peter_700]

It is burning alot about 200ml for 100 miles. If you start the bike take it for a ride and then get back put it on the main stand and rev it quite alot of blue smoke comes out of the exhaust. will it get worst ?

[Itchy]

Probably will sounds like the piston rings are worn , which means new barrel/rebore and new piston rings , which is a fairly big job to do.

Either live with it and the 1p an extra cost per mile in oil burnage. Or replace the entire engine you can get them on ebay for about £120. Changing the engine on a Cg125 is very easy as its such a simple bike.


Heh some people on here on GS500Es have run bikes that burn petrol and oil at a ratio of 2:1.
____________________
Spain 2008France 2007Big one 2009 We all die. The goal isn't to live forever, the goal is to create something that will. In the end, your life will flash before your eyes. Make sure it is worth watching.

[peter_700]

ok i think i will live with it and buy cheap oil. Will it start to get worst and burn more oil ?

[The Artist]

Yes. I strongly recommend you replace the barrel, piston and rings.

[Itchy]

[peter_700]

How much are we talking to get that done £200, £300 ?if i took it to my local honda dealer .

[peter_700]

the problem is i only payed £450 for the bike , i don't want to pore money into a very old bike

[peter_700]

As the bike will probably need reboring any way can you buy big bore kits for cgs ?

[Itchy]

I think what you should do ultimately depends on what you intend to use the bike for and how long you intend to keep it for...

Inthat if you are getting rid within a year or so , I'd live with it, if I were to say ride round the world on it I would rebore it like with my XT600.
____________________
Spain 2008France 2007Big one 2009 We all die. The goal isn't to live forever, the goal is to create something that will. In the end, your life will flash before your eyes. Make sure it is worth watching.

[peter_700]

you are right i am only going to keep the bike a maximum of another year. Untill i have got more experiance then i sell the cg and buy a better 125 or go for direct accses.

[Billing]

Mine burns a bit of oil, just keep an eye on it mate, as for big boring, get a cbx550 piston (1mm oversize) with the appropriate rings, have the barrel bored to suit, it uses the same size gudgeon pin and takes the capacity up to 135 -140cc iirc, as long as the bottom end is in reasonable condiotion it should take it ok
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